toString() on struct template

[Daniel Keep]

Henning Hasemann wrote:
> O
>> And finally compiled it like thus:
>>
>>     dmd FooLib.lib main.d
>>
>> This would fail since FooLib.lib doesn't actually *have* the
>> implementation of Foo in it.  In order for D to compile a templated
>> struct or class into a library, it would need to compile it for every
>> possible type, which obviously isn't going to happen.
> 
> The more I play around with my code the more I think you are right.
> But I dont understand why I dont get an error at compile time but at
> runtime?
> Shouldnt the compiler already see if the template instantiation
> is available or not in the linking step?

Yes, it should... I thought these were link errors, which leads me to...

>> If you want to use templates in a library, you *need* to ship and
>> compile against the source code, not against a precompiled library.  The
>> one exception to this is that it should work for any templates you've
>> explicitly instantiated. So, if you append this to Foo's source file:
>>
>>   alias Foo!(int) FooInt;
>>
>> then it should work.
> 
> The problem occurs also when the "main module" does not call any template
> function but only code from inside the library does.
> Can you explain that with your theory?
> What would be the solution?
> 
> Henning

I think the best explanation in that case would be: "I was wrong."  It
was something of a long-shot, stab in the dark guess...

Sorry.

	-- Daniel

-- 
Unlike Knuth, I have neither proven or tried the above; it may not even
make sense.

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